Hans, the following sample shows an issue with attachments: \setupinteraction[state=start] \setupinteractionscreen[option=attachment] \setuppapersize[A5, landscape] \setuppagenumbering[location=] \starttext \input knuth\attachment[file=e.pdf, title=Attachment \letterhash1, author=ConTeXt, subtitle=χαλεπὰ τὰ καλά, method=hidden] \stoptext method=hidden (http://pdf.ousia.tk/attachment-hidden.pdf) doesn’t actually attach the file (http://pdf.ousia.tk/attachment-hidden.png). But method=visible (http://pdf.ousia.tk/attachment-visible.pdf) attachs the file (http://pdf.ousia.tk/attachment-visible.png) I’m afraid that method=hidden was missing subtitle, file and name. I would say that buffer is also missing there, but I don’t know what it is used for. The attached .diff file fixes the issue. I have tested it and it works fine. I hope it helps, Pablo -- http://www.ousia.tk